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LettersFull Access

Association Between Low Barometric Pressure and Completed Suicides

Published Online:1 Sep 2017https://doi.org/10.1176/appi.ajp.2017.17020154

To the Editor: Associations between low barometric pressure and behavior have been previously demonstrated, including associations with both violence and suicide attempts (1, 2). We extend those associations to completed suicides in the first North American study with an adequate sample size of 714 completed suicides.

The Jefferson County, Ky., medical examiner’s office provided information regarding the dates of completed suicides between January 2000 and December 2011. Meteorological data were obtained from the Louisville office of the National Weather Service for this same 11-year period.

There were 714 completed suicides in the 11 years studied. Information on age, gender, and method of suicide was not available. Barometric pressure was lower on days with completed suicides than on days without any completed suicides (29.48 inHg [SD=0.038], compared with 29.53 inHg [SD=0.0036], respectively; p<0.0001, t=2.44). Neither average daily temperature (59.1°F [SD=0.67] for suicide days, compared with 58.1°F [SD=0.37] for nonsuicide days; p=0.63, t=0.92) nor solar radiation (6.95 MJ/m2 [SD=0.11] for suicide days, compared with 6.96 MJ/m2 [SD=0.06] for nonsuicide days; p=0.09, t=0.13) showed a relationship to completed suicide.

A multitude of biological, psychological, social, and environmental factors can play a role in a person’s decision to commit suicide. Although we have demonstrated a significant association between lower barometric pressure and completed suicide, the mechanism of the effect—which has now been demonstrated worldwide (3–5)—remains to be determined.

From the Department of Psychiatry and Behavioral Sciences, University of Louisville School of Medicine, Louisville.
Address correspondence to Dr. El-Mallakh ().

Dr. El-Mallakh has received grant support from Alexza, Janssen, NIMH, Sage, and the state of Kentucky, and has served on the speakers bureau for Allergan, Lundbeck, Merck, Otsuka, and Takeda. Dr. Wright owns stock in Empower Interactive and Mindstreet; has received royalties from American Psychiatric Association Publishing, Guilford, and Simon & Schuster; and has received grant support from the Agency for Healthcare Research and Quality (1R18HS024047-01). The other authors report no financial relationships with commercial interests.

References

1 Hiltunen L, Ruuhela R, Ostamo A, et al.: Atmospheric pressure and suicide attempts in Helsinki, Finland. Int J Biometeorol 2012; 56:1045–1053Crossref, Medline, Google Scholar

2 Schory TJ, Piecznski N, Nair S, et al.: Barometric pressure, emergency psychiatric visits, and violent acts. Can J Psychiatry 2003; 48:624–627Crossref, Medline, Google Scholar

3 Yan YY: Geophysical variables and behavior: LXXXXIX: the influence of weather on suicide in Hong Kong. Percept Mot Skills 2000; 91:571–577Crossref, Medline, Google Scholar

4 Yang AC, Tsai SJ, Huang NE: Decomposing the association of completed suicide with air pollution, weather, and unemployment data at different time scales. J Affect Disord 2011; 129:275–281Crossref, Medline, Google Scholar

5 Wu YW, Chen CK, Wang LJ: Is suicide mortality associated with meteorological and socio-economic factors? An ecological study in a city in Taiwan with a high suicide rate. Psychiatr Danub 2014; 26:152–158Medline, Google Scholar